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Yanmar 4JH3E. ovrheating replaced impeller, water pump checked thermostat Any ideas what else can be problem?

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Blown head gasket will also cause the problem .

Posted on Dec 21, 2016

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I am losing about 1/2 pint coolant every 1000 miles. the vehicle does not ovrheat at all.


check sump oil color
If grey that is coolant into the sump , probably from behind the water pump impeller
because water loss is not evident the fact that there is loss means that there is a leak some where
There is a drain hole under the water pump housing and if the seal is gone the water will leak out there under pressure and when operating and the coolant is lost in the air stream
Take it to an accredited radiator shop and have the system pressure tested

Feb 27, 2016 | 2006 Chevrolet Malibu LT

1 Answer

My 96 ford contour sport it overheating after you drive it for about 10 minutes. I have replaced the radiator, thermostat, and the thermostat housing. Could it be the water pump or the heads???


Hi, welcome to FixYa.com my name is Shawn and I will be answering your question.

Check the water pump they used to break the impellers back then. You will need to remove the water pump to check the internal impeller.

I hope my assistance helped you and resolved your concern, if you need further assistance please as

Aug 09, 2011 | 1996 Ford Contour

1 Answer

I have a 98 bmw 740il that keeps overheating. I have replaced the water pump about 6 months ago. I have removed the over flow tank and check for cracks. It is in good condition. I also have no heat. The...


I am not aying that this is what I think it is but I found this on your year BMW

Some BMW, Volkswagen and Audi cars have a common problem that the water pump impeller becomes dislodged from the input shaft of the water pump leaving the water pump looking ok from the outside, but failed on the inside. If your car experiences this problem it will over heat rapidly much like a thermostat failure. For exact specific repair procedures for this repair visit our online repair manual page.




Failed BMW, VW, Audi Water Pump Troubleshooting Procedure
  • Check Water Pump Operation - To troubleshoot this problem first drain about a half a gallon out of the cooling system, next remove the thermostat from the engine. With the thermostat out start the engine (stand back) coolant should be forced out of the thermostat port, if not the impeller has dislodged itself from the water pump input shaft and needs to be replaced. To replace the water pump finish draining the remainder of engine coolant, remove the serpentine belt and coolant hoses. Next remove the water pump mounting bolts and remove the water pump. Clean gasket surfaces and reinstall new water pump and reassemble. Refill with coolant and recheck system, top off engine coolant after it has re-cooled.

Nov 23, 2010 | 1998 BMW 7 Series

1 Answer

My 1995 bmw m3 overheats, but when i decelerate it starts to cool down, im thinking water pump im going to replace it with a metal impeler, should i be doing something different?


replacing the water pump is an ok idea. replace thermostat with a 12 degree cooler running one. drill 3/16" holes in it 180 degrees apart from each other. replace the thermostat housing with a metal one.

check the radiator as well. clogged or blocked. upon re-assembly make sure you don't have an air gap. re-bleed the system 15 minutes after you think you're done.

Jun 26, 2010 | 1995 BMW M3

1 Answer

On my way to work my tempo overheated and shut down. could this be the thermostat or water pump


check for water flow in the radiator. if the hoses dont expand when you rev the engine, the water pump is probably bad. alot of the factory water pumps have a plastic impeller on them, and the impeller will break in pieces inside the pump housing. if you take the hose off the pump you can see the impeller. napa sells a new one with a aluminum impeller and its a new one, not rebuilt.

Jul 17, 2009 | 1991 Ford Tempo 4 Door

3 Answers

Overheating problems


possible cracked head, timing, water pump are the only other things left to check

Jun 26, 2009 | 1988 Nissan Pulsar

2 Answers

Bad Water Pump??


sounds like the thermostat stuck closed, a water pump would not cause this problem, replace the T-stat.

May 04, 2009 | 2004 Ford Taurus

7 Answers

Overheating problem


water pump. water pump. water pump. i am a vw dealer tech and on 2.0 and 1.8t beetles the water pump impeller is plastic, and what happens is usually another component, fans, fan control module (under battery tray), thermostat, fails and because the impeller is plastic with just one overheat the plastic becomes brittle and shatters, pull the water pump out and you will see the impeller in 3 or 4 pieces. replace water pump and make sure t stat opens, fans come on (a/c off) and proper water pump flow.

Jul 29, 2008 | 2000 Volkswagen Beetle

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